HP LaserJet Enterprise MFP M430 LaserJet Enterprise MFP M430 M431 User Guide - Page 210

Table 9-12 Streak defects (continued) Sample Description Dark vertical lines which occur down the length of the page. The defect might occur anywhere on the page, in areas of fill or in sections with no printed content. Possible solutions 1. Reprint the document. 2. Remove the cartridge, and then shake it to redistribute the toner. Reinsert the toner cartridges into the printer and close the cover. For a graphical representation of this procedure, see Replace the toner cartridges. 3. Print a cleaning page. 4. Check the toner level in the cartridge. 5. If the issue persists, go to support.hp.com. Improve copy image quality If the printer is having copy quality problems, try the following solutions in the order presented to resolve the issue. Try these few simple steps first: ● Use the flatbed scanner rather than the document feeder. ● Use high-quality originals. ● When using the document feeder, load the original document into the feeder correctly, using the paper guides, to avoid unclear or skewed images. If the problem still exists, try these additional solutions. If they do not fix the problem, see "Improve print quality" for further solutions. Check the scanner glass for dirt and smudges Learn about solving copy-quality debris problems. Over time, specks of debris might collect on the scanner glass and document feeder white plastic backing, which might cause print defects. Use the following procedure to clean the scanner if the printed pages have streaks, unwanted lines, black dots, poor print quality, or unclear text. 1. Press the power button to turn the printer off, and then disconnect the power cable from the electrical outlet. 198 Chapter 9 Solve problems